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'Sponge cities' aim to reduce risk of floods
04:24

"Sponge cities" aim to ensure that infrastructure can absorb and store rainwater like a sponge, and ease the impact of rainy and dry seasons. China has 30 pilot "sponge cities" and aims to refit 80 percent of its urban areas by 2030. Listen to Professor Chen Long from Beijing University of Technology on the topic.

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